Scholarlink

Abstract <p>The paper presents results of U–Pb SHRIMP-II dating and describes some features of zircon grains from unmigmatized plagiogneisses of the Mariinsky Formation, Trans-Urals. It is shown that the zircon consists of rims, which grew as a result of granulite-facies metamorphism no older than the Late Riphean, and cores of detrital origin, dated within the range from the Archean–Proterozoic boundary to Late Riphean. The data suggest that before the onset of migmatization, the Mariinsky gneisses were formed independently of the Paleozoic Ural formations.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

U–Pb Age of Zircons from Gneisses of the Mariinskaya Formation, Southern Urals, and Problems Related to the Precambrian in the Trans-Urals

  • 期刊论文

  • 发表日期：

    2026年7月22日

查看全文
  • T. A. Osipova,
  • A. A. Krasnobaev,
  • S. V. Busharina

摘要

Abstract

The paper presents results of U–Pb SHRIMP-II dating and describes some features of zircon grains from unmigmatized plagiogneisses of the Mariinsky Formation, Trans-Urals. It is shown that the zircon consists of rims, which grew as a result of granulite-facies metamorphism no older than the Late Riphean, and cores of detrital origin, dated within the range from the Archean–Proterozoic boundary to Late Riphean. The data suggest that before the onset of migmatization, the Mariinsky gneisses were formed independently of the Paleozoic Ural formations.